The first sense of change was heat. Jeff stared sweating like crazy, and when he raised his hand to wipe off his forehead, he discovered that brown hair was spreading over his arms. The hair was a lot longer around his wrists and white, and his hands were getting heavy and thick.
Looking down, he saw that his human dick was swelling up and getting dark, and his balls already looked like black oranges. His feet were lumps like his hands, and he fell foward heavily as balance shifted. The floorboards creaked as his weight increased drastically, 500 pounds - 700 pounds - 1,000 pounds - 1,200 pounds.
Both Brunos yelped and scrambled into the corner as he snorted and whinneied in fright. Jeff was fully aware of the changes, and also knew he might crash through the floor if he got much bigger. But he had selected the options so that only he would know about the changes. How could the program makea horse fit into this bedroom?
Support beams cracked ominously and the floor started to sag as Jeff reached close to a ton in weight. His ears brushed the ceiling - and then it was gone. Blinking, Jeff suddenly found himself outside in a small corral. There were other horses nearby, glossy golden and white Clydesdale mares from the smell.
Huh? Sure enough, he was a perfect Clydesdale stallion, but he was fenced in his own little area. It was hard to make out much with horse's eyesight, but he finally recognized the symbol painted ont he barn behind him. He was apparently part of the Budweiser Beer Clydesdale hitch!
In order to make the change seem normal to everyone else, the program must have changed reality to give him a new identity! He was now a stud stallion who had been born and raised as part of the Brewery horse operation. He even had the memories and knowledge of a ten year-old Clydesdale, though he was aware of his human past.
It was a shame the mares were penned up somewhere else, but he only had to spend an hour like this anyway. Jeff shook himself, and tried grazing, and relaxed to enjoy being a horse.